Happy99

[10][11] On 3 March 1999, a Tokyo job company accidentally sent 4000 copies of the virus to 30 universities in Japan.

[12] Dan Schrader of Trend Micro said that Happy99 was the single most commonly reported virus in their system for the month of March.

[16] Marius Van Oers, a researcher for Network Associates, referred to Happy99 as "a global problem", saying that it was one of the most commonly reported viruses in 1999.

[23] The worm modifies a registry key to automatically start itself when the computer is rebooted.

[24] The executable of the worm is 10,000 bytes in size; a list of spammed newsgroups and mail addresses is stored on the infected hard drive.